#1049: Inconsistency with POINT(nan nan)
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Reporter: Mike Taves | Owner: geos-devel@…
Type: defect | Status: new
Priority: major | Milestone:
Component: Default |Version: master
Severity: Unassigned | Keywords:
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Consider two points that use the "NaN" convention to try and create `POINT
EMPTY`. This example uses shapely:
{{{
from shapely import wkt
from shapely.geometry import Point
# two different ways to create a point with NaN
point_nan_from_val = Point(float('nan'), float('nan'))
point_nan_from_wkt = wkt.loads('point(nan nan)')
point_nan_from_val.is_empty # False
point_nan_from_wkt.is_empty # True
point_nan_from_val.wkt # POINT (nan nan)
point_nan_from_wkt.wkt # POINT EMPTY
}}}
And a similar example with PyGEOS (master), which side-steps #1048 by
[https://github.com/pygeos/pygeos/pull/179 correctly writing WKB] for
POINT EMPTY:
{{{
import pygeos
point_nan_from_val = pygeos.points(float('nan'), float('nan'))
point_nan_from_wkt = pygeos.Geometry('point(nan nan)')
pygeos.is_empty(point_nan_from_val) # False
pygeos.is_empty(point_nan_from_wkt) # True
# Different WKT
pygeos.to_wkt(point_nan_from_val) # POINT (nan nan)
pygeos.to_wkt(point_nan_from_wkt) # POINT EMPTY
# Same WKB
pygeos.to_wkb(point_nan_from_val) == pygeos.to_wkb(point_nan_from_wkt) #
True
}}}
The two points behave very differently, with different WKT and same WKB
(when #1048 is resolved).
Seeing that `POINT EMPTY` is generally serialised in WKB as `POINT(nan
nan)` (#1005), it could be expected that geometries created with nan
coordinate values should be `POINT EMPTY` too, and not non-empty points
with nan coordinates.
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Ticket URL:
GEOS
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite
(JTS).
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